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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4e46215a23d024532173f14ed37e10d8396e378c1629bd947553b748f6001d' 
  AND token = 'Dgwelqug0PleW8vdc42hZ/RYl4JAbDteXm6ulZFqE98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}